由钾和氧组成的某种离子晶体中含钾的质量分数为78/126，其阴离子只有过氧离子（O22－）和超氧离子（O2－）两种。在此晶体中，过氧离子和超氧离子的物质的量之比为（）

离子晶体比金属的导电性好。

试分析离子晶体中，阴离子扩散系数－般都小于阳离子扩散系数的原因。

试分析离子晶体中，阴离子扩散系数－般都小于阳离子扩散系数的原因？

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

The （） is used for hauling in or letting out the wires or ropes.

Vessels must be（）valid certificate of nationality or certificated of registry or license.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

纯金属的流动性比合金好。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。